CN107774942B - Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method - Google Patents
Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method Download PDFInfo
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- CN107774942B CN107774942B CN201711044888.9A CN201711044888A CN107774942B CN 107774942 B CN107774942 B CN 107774942B CN 201711044888 A CN201711044888 A CN 201711044888A CN 107774942 B CN107774942 B CN 107774942B
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- roller
- continuous casting
- sufficient roller
- projections
- length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
Abstract
The invention belongs to slab production technical fields, specifically disclose a kind of sheet billet continuous casting convex sufficient roller and improvement center segregation of continuous cast slab and loose method, it is intended to solve the problem of how to weaken center segregation of continuous cast slab and mitigate its center porosity.The convex sufficient roller of the sheet billet continuous casting, including roller body and the bulge-structure being arranged on roller body, the bulge-structure includes the intermediate projections and two side projections being symmetricly set on roller body being arranged in the middle part of roller body.The center segregation of continuous cast slab that improves uses the withdrawal straightening machine with above-mentioned convex sufficient roller to carry out pressure processing to the continuous casting steel billet for entering secondary cooling zone with loose method.Above-mentioned sheet billet continuous casting can carry out specific aim pressure in the resolidified region form in solidification latter stage to continuous casting steel billet with convex sufficient roller, continuous casting steel billet is effectively hindered to include the molten steel flow of enrichment segregation element to weaken center segregation, while compensating the solidification shrinkage amount of continuous casting steel billet to mitigate its center porosity.
Description
Technical field
The invention belongs to slab production technical fields, and in particular to a kind of sheet billet continuous casting convex sufficient roller and improvement continuous casting steel billet
Center segregation and loose method.
Background technique
The pressure of secondary cooling zone continuous casting billet is to improve continuous casting billet center segregation and loose effective technology, and principle is: by
Continuous casting billet solidification latter stage is applied around pressure and generates certain drafts to slab, hinders the molten steel flow of the segregation element containing enrichment
To weaken center segregation, while the solidification shrinkage amount of continuous casting billet is compensated to mitigate center porosity.The pressure of application is mainly machine
Tool stress, wherein drafts is to determine that how many important parameters is implemented in pressure.
With the increase of casting blank cross-section size, on the one hand, the volume for compensating solidification shrinkage significantly increases, and wick-containing is squeezed and deformed
Amount increases；On the other hand, the solidified shell of thickening causes pressure process resistance of deformation to increase.Therefore, traditional soft reduction technique
Have been unable to meet the production requirement of big cross section continuous casting billet.In consideration of it, domestic and international researcher is proposed by increasing continuous casting billet solidification
Solute segregation molten steel is discharged to squeeze in end drafts, while skill under the big pressure/weight of solidification end of soldering central pipe
Art.Due to many continuous casting machine energy power limits, weight Reduction Technology is difficult to realize, therefore researcher proposes skill under convex roll-in
Art under the premise of not increasing depressing force, reduces pressure area, increases and depress pressure in the middle part of slab.
Periodical literature (in (ISIJ International, Vol.52 (2012), No.7, pp.1266-1272), South Korea Pu
The scholar of item carried out experimental study.The convex roller that they propose is mainly characterized by: the roller of diameter 450mm, the intermediate region 300mm
It is wherein double 1/4 rounded transitional arcs of radius 40mm between crowning and plane for crowning.This roll structure can be mentioned significantly
High wick-containing is squeezed ability, the drafts of 14mm can reach after transformation be transformed before 30mm drafts technological effect.However, this
Design structure will inevitably cause the stress at double 1/4 rounded transitional arc positions to be concentrated, to cause slab Corner Crackss.
The application for a patent for invention that number of patent application is 201410666353.5, discloses a kind of drawing for bloom continuous casting
It rectifys machine gradual curvature convex roller and application method, the withdrawal straightening machine gradual curvature convex roller of the invention is made of roll shaft and the body of roll,
The middle body of roll by starting the arc area and becomes arc district's groups at rising at, the curvature transition region by marginal zone, gradual curvature area and plain-barreled roll district's groups
The arcing point in arc area is gradually increased to camber line curvature between acnode is become, the change acnode in the area Bian Hu to camber line curvature between end acnode by
Decrescence small, plain-barreled roll area is in convex shape relative to marginal zone.Have the withdrawal straightening machine of gradual curvature convex roller to generous using at least 4 framves
Base continuous casting billet is depressed, and center segregation and loose improved continuous casting billet are finally obtained.The gradual curvature convex of the invention
Roller realizes the smooth transition in plain-barreled roll area Yu the area Tu Gun, effectively prevents crack defect caused by concentrating because of transition region stress.So
And above-mentioned patent all uses under the convex roll-in of slab top, and is only used for square billet and rectangular bloom, and not applicable continuous casting plate
Base.
For continuous casting steel billet since width and thickness ratio is larger, solidification behavior and square billet have notable difference.Square billet finally solidifies
Region is generally at slab center, and the Coagulated hemothorax of slab has following three kinds of forms: first is that, concentrate on the middle part of width of plate slab
Position；Second is that the intermediate position of width of plate slab is more, two sides position is few；Third is that the intermediate position of width of plate slab is few, two sides position is more.
Therefore, slab is depressed greatly using conventional flatfoot roller or convex sufficient roller, final effect by slab corner and other first coagulate
Gu the influence in region is very big.Firstly, being influenced by equipment pressure ability, it cannot be guaranteed that the drafts of sufficient roller；Secondly, capacity of equipment
When enough, excessive depressing force may cause the cracked defect of corner low-temperature space.
Summary of the invention
The present invention provides a kind of convex sufficient rollers of sheet billet continuous casting, it is intended to solve how to weaken center segregation of continuous cast slab, and
The problem of mitigating its center porosity.
The technical solution adopted by the present invention to solve the technical problems is: the convex sufficient roller of sheet billet continuous casting, including roller body and
Bulge-structure on roller body is set, and the bulge-structure includes intermediate projections in the middle part of roller body being arranged in and two right
Claim the side projections being arranged on roller body.
Further, the both ends of the intermediate projections and the both ends of side projections are pyramidal structure or arc-shaped transition
Structure.
Further, the radius of the intermediate projections is identical with the radius of side projections, and than the half of roller body
Big 10~the 35mm of diameter.
Further, the length of the intermediate projections is 80~300mm；The length and intermediate projections of the side projections
Length differ 0~50mm.
Further, the length of the intermediate projections is 50~200mm.
Further, the middle part of the side projections side end of continuous casting steel billet the distance between close with it is
/ 8th of continuous casting steel billet width.
The present invention also provides a kind of improvement center segregation of continuous cast slab and loose method, using withdrawal straightening machine to entering two
The continuous casting steel billet of cold-zone carries out pressure processing；The withdrawal straightening machine includes upper sufficient roller and lower sufficient roller, and the upper sufficient roller is any one
The convex sufficient roller of above-mentioned sheet billet continuous casting, the lower sufficient roller are the convex sufficient roller of flatfoot roller or any one above-mentioned sheet billet continuous casting.
Further, the upper limb of the plain-barreled roll of the upper limb and secondary cooling zone front end of the bulge-structure on the lower sufficient roller keeps water
It is flat；The intermediate projections of the lower sufficient roller are 30~100mm longer than the intermediate projections of upper sufficient roller, and the side projections of the lower sufficient roller are than upper
Long 30~the 100mm of the side projections of sufficient roller.
Further, the withdrawal straightening machine is five or more；
In throwing direction, the length of intermediate projections and the length of side projections of the upper sufficient roller of each withdrawal straightening machine successively subtract
Small, the length of the side projections of the length and adjacent two upper sufficient rollers of the intermediate projections of the upper sufficient roller of adjacent two differs 20
~50mm；
In throwing direction, the length of intermediate projections and the length of side projections of the lower sufficient roller of each withdrawal straightening machine successively subtract
Small, the length of the side projections of sufficient roller differs 20 under the length of the intermediate projections of sufficient roller and adjacent two under adjacent two
~50mm.
Further, the drafts of the upper sufficient roller of each withdrawal straightening machine is sequentially increased, the pressure of first upper sufficient roller in throwing direction
Lower amount is 2~3.5mm, and the drafts of adjacent two upper sufficient rollers differs 0.5~2mm.
The beneficial effects of the present invention are: by the way that the protrusion including intermediate projections and two side projections is arranged on roller body
Structure can carry out specific aim pressure in the resolidified region form in solidification latter stage to continuous casting steel billet, make full use of hydraulic cylinder
Lower pressure, increase the drafts of continuous casting steel billet reasonable pressure range, continuous casting steel billet effectively hindered to include enrichment segregation element
Molten steel flow compensates the solidification shrinkage amount of continuous casting steel billet to mitigate center porosity, and reduce company to weakening center segregation
Cast panel base corner stress.The method of the present invention uses the withdrawal straightening machine with the convex sufficient roller of the present invention to carry out pressure processing to continuous casting steel billet,
And the upper and lower sufficient roller of each withdrawal straightening machine is rationally designed, while the drafts of withdrawal straightening machine is rationally controlled, it can be significantly
It improves and effect is depressed to continuous casting steel billet, effectively decrease center segregation of continuous cast slab, and mitigate its center porosity.
Detailed description of the invention
Fig. 1 is the sheet billet continuous casting implementation structural schematic diagram of convex sufficient roller in the present invention；
Fig. 2 is the working state schematic representation depressed using a kind of withdrawal straightening machine to continuous casting steel billet；
Fig. 3 is the working state schematic representation depressed using another withdrawal straightening machine to continuous casting steel billet；
In the figure, it is marked as roller body 100, intermediate projections 110, side projections 120, continuous casting steel billet 200.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, the convex sufficient roller of sheet billet continuous casting, including roller body 100 and the protrusion knot being arranged on roller body 100
Structure, the bulge-structure include be arranged in the middle part of roller body 100 intermediate projections 110 and two be symmetricly set on roller body
Side projections 120 on 100.It include the convex of intermediate projections 110 and two side projections 120 by being arranged on roller body 100
Structure is played, resolidified region form of the sheet billet continuous casting with convex sufficient roller to continuous casting steel billet 200 in solidification latter stage is enabled to carry out needle
Property is depressed, the lower pressure of hydraulic cylinder is made full use of, increases the drafts of the reasonable pressure range of continuous casting steel billet 200, effectively hinders
Continuous casting steel billet 200 includes the molten steel flow of enrichment segregation element to weaken center segregation, while compensating the solidifying of continuous casting steel billet 200
Gu shrinkage reduces 200 corner stress of continuous casting steel billet to mitigate center porosity.
Wherein, the both ends of intermediate projections 110 are usually pyramidal structure or arc-shaped transition structure, and the two of side projections 120
End is generally also pyramidal structure or arc-shaped transition structure.The radius of intermediate projections 110 is identical with the radius of side projections 120,
And 10~35mm bigger than the radius of roller body 100, i.e. the height of bulge-structure protrusion roller body 100 is 10~35mm.
Preferably, the length of intermediate projections 110 is 80~300mm, the length and intermediate projections of the side projections 120
110 length differs 0~50mm.The convex sufficient roller of sheet billet continuous casting mainly includes with the upper sufficient roller and use in 200 upside of continuous casting steel billet
Lower sufficient roller in the downside of continuous casting steel billet 200, the length for being typically used as intermediate projections 110 on the roller body 100 of sufficient roller is 50~
200mm, it is intermediate convex on roller body 100 of the length than being used as upper sufficient roller of intermediate projections 110 on the roller body 100 as lower sufficient roller
Play the 110 long 30~100mm of length.
In order to enable the convex sufficient roller to play ideal center segregation and loose control effect, such as Fig. 2 to continuous casting steel billet 200
Or shown in Fig. 3, making the distance between middle part and its close side end of continuous casting steel billet 200 of side projections 120 is continuous casting
/ 8th of 200 width of slab.The width of continuous casting steel billet 200 is indicated in figure 2 and figure 3 with L.Two sides are enabled in this way
Portion's protrusion 120 just corresponds to the resolidified region of 200 width direction two sides of continuous casting steel billet, acts on depressing force completely thereon, with reality
Existing above-mentioned purpose.
Improve center segregation of continuous cast slab and loose method, this method is using withdrawal straightening machine to the continuous casting plate for entering secondary cooling zone
Base 200 carries out pressure processing；The withdrawal straightening machine includes upper sufficient roller and lower sufficient roller, and the upper sufficient roller is any one above-mentioned slab
The convex sufficient roller of continuous casting；The lower sufficient roller is flatfoot roller, as shown in Figure 2；Alternatively, lower foot roller is any one above-mentioned sheet billet continuous casting
With convex sufficient roller, as shown in Figure 3.
As a kind of preferred embodiment of the method for the present invention, the upper limb of the bulge-structure on the lower sufficient roller and secondary cooling zone front end
The upper limb of plain-barreled roll keep horizontal；The intermediate projections 110 of the lower sufficient roller are 30~100mm longer than the intermediate projections 110 of upper sufficient roller,
The side projections 120 of the lower sufficient roller are 30~100mm longer than the side projections 120 of upper sufficient roller.
As another preferred embodiment of the method for the present invention, the withdrawal straightening machine is five or more；
In throwing direction, the length of the length of the intermediate projections 110 of the upper sufficient roller of each withdrawal straightening machine and side projections 120 according to
The length of the side projections 120 of secondary reduction, the length of the intermediate projections 110 of adjacent two upper sufficient rollers and adjacent two upper sufficient rollers
Degree differs 20~50mm；
In throwing direction, the length of the length of the intermediate projections 110 of the lower sufficient roller of each withdrawal straightening machine and side projections 120 according to
Secondary reduction, under adjacent two under the length of the intermediate projections 110 of sufficient roller and adjacent two side projections 120 of sufficient roller length
Degree differs 20~50mm.
On the basis of the above, in order to reach better improvement, in throwing direction, the pressure of the upper sufficient roller of each withdrawal straightening machine
Amount is sequentially increased, and the drafts of first upper sufficient roller is 2~3.5mm, and the drafts of adjacent two upper sufficient rollers differs 0.5~2mm.
Embodiment 1
Above-mentioned is improved into center segregation of continuous cast slab and loose method using Mr. Yu steel mill 230mm × 1850mm slab
Conticaster.
As shown in Fig. 2, carrying out pressure processing to the continuous casting steel billet 200 for entering secondary cooling zone using withdrawal straightening machine；The withdrawal straightening machine
Including upper sufficient roller and lower sufficient roller, the upper sufficient roller is the convex sufficient roller of any one above-mentioned sheet billet continuous casting, and the lower sufficient roller is flat
Sufficient roller；
Wherein, the withdrawal straightening machine depressed is 5；
In throwing direction, the length of the length of the intermediate projections 110 of the upper sufficient roller of each withdrawal straightening machine and side projections 120 according to
Secondary reduction, the length of the intermediate projections 110 of first upper sufficient roller are 220mm, the length of the intermediate projections 110 of adjacent two upper sufficient rollers
Degree difference 30mm；The length of the side projections 120 of first upper sufficient roller is 220mm, the side projections 120 of adjacent two upper sufficient rollers
Length differ 30mm；
In throwing direction, under the conditions of pulling rate is 0.9m/min, each withdrawal straightening machine drafts is successively are as follows: 3.0mm, 3.6mm,
5.0mm, 7.4mm, 9.0mm, overall reduction 28.0mm.
Through detecting, the center segregation of continuous cast slab and loose grading that final production goes out be reduced to 0.5 from 1.0~.5 grades~
1.0 ranks, commercial stock center porosity≤1.5 grade, ratio are improved from 30% to 90% or more.
Embodiment 2
Above-mentioned is improved into center segregation of continuous cast slab and loose method using Mr. Yu steel mill 230mm × 1850mm slab
Conticaster.
As shown in figure 3, carrying out pressure processing to the continuous casting steel billet 200 for entering secondary cooling zone using withdrawal straightening machine；The withdrawal straightening machine
Including upper sufficient roller and lower sufficient roller, the upper sufficient roller and lower sufficient roller are the convex sufficient roller of any one above-mentioned sheet billet continuous casting；
Wherein, the withdrawal straightening machine depressed is 5, the upper limb of the bulge-structure on lower foot roller and the plain-barreled roll of secondary cooling zone front end
Upper limb keep horizontal；
In throwing direction, the length of the intermediate projections 110 of the upper and lower sufficient roller of each withdrawal straightening machine and the length of side projections 120
It is sequentially reduced；The length of the intermediate projections 110 of first upper sufficient roller is 220mm, the intermediate projections 110 of adjacent two upper sufficient rollers
Length differ 30mm；The length of the side projections 120 of first upper sufficient roller is 250mm, and the side of adjacent two upper sufficient rollers is convex
The length for playing 120 differs 30mm；The length of the intermediate projections 110 of sufficient roller is 280mm under first, under adjacent two in sufficient roller
Between protrusion 110 length differ 30mm；The length of the side projections 120 of sufficient roller is 280mm, sufficient roller under adjacent two under first
Side projections 120 length differ 30mm；
In throwing direction, under the conditions of pulling rate is 0.9m/min, each withdrawal straightening machine drafts is successively are as follows: 3.0mm, 3.6mm,
5.0mm, 7.4mm, 9.0mm, overall reduction 28.0mm.
Through detecting, 200 center segregation of continuous casting steel billet and loose grade from 1.0~1.5 grades that final production goes out are reduced to 0.5
~1.0 ranks, commercial stock center porosity≤1.5 grade, ratio are improved from 30% to 93% or more.
Claims (9)
1. the convex sufficient roller of sheet billet continuous casting, including roller body (100) and the bulge-structure being arranged on roller body (100), feature
Be: the bulge-structure includes that the intermediate projections (110) being arranged in the middle part of roller body (100) and two are symmetricly set on roller
Side projections (120) on ontology (100)；The middle part of the side projections (120) and its close continuous casting steel billet (200)
The distance between side end is 1/8th of continuous casting steel billet (200) width.
2. the convex sufficient roller of sheet billet continuous casting as described in claim 1, it is characterised in that: the both ends of the intermediate projections (110) and
The both ends of side projections (120) are pyramidal structure or arc-shaped transition structure.
3. the convex sufficient roller of sheet billet continuous casting as described in claim 1, it is characterised in that: the radius of the intermediate projections (110) and
The radius of side projections (120) is identical, and the radius than roller body (100) is 10~35mm big.
4. the convex sufficient roller of sheet billet continuous casting as claimed in claim 3, it is characterised in that: the length of the intermediate projections (110) is
80~300mm；The length of the side projections (120) differs 0~50mm with the length of intermediate projections (110).
5. the convex sufficient roller of sheet billet continuous casting as claimed in claim 3, it is characterised in that: the length of the intermediate projections (110) is
50~200mm.
6. improving center segregation of continuous cast slab and loose method, it is characterised in that: using withdrawal straightening machine to the company for entering secondary cooling zone
Cast panel base (200) carries out pressure processing；The withdrawal straightening machine includes upper sufficient roller and lower sufficient roller, and the upper sufficient roller is claim 1 to 5
Any one of described in the convex sufficient roller of sheet billet continuous casting, the lower sufficient roller is any one of flatfoot roller or claim 1 to 5 institute
The convex sufficient roller of the sheet billet continuous casting stated.
7. improving center segregation of continuous cast slab and loose method as claimed in claim 6, it is characterised in that: the lower sufficient roller
On the upper limb of bulge-structure and the upper limb of plain-barreled roll of secondary cooling zone front end keep horizontal；The intermediate projections (110) of the lower sufficient roller
Intermediate projections (110) than upper sufficient roller are 30~100mm long, and the side projections (120) of the lower sufficient roller are more convex than the side of upper sufficient roller
Play (120) long 30~100mm.
8. improvement center segregation of continuous cast slab and loose method as claimed in claims 6 or 7, it is characterised in that: the drawing
The machine of rectifying is five or more；
In throwing direction, the length of the length of the intermediate projections (110) of the upper sufficient roller of each withdrawal straightening machine and side projections (120) according to
Secondary reduction, the side projections (120) of the length of the intermediate projections (110) of adjacent two upper sufficient rollers and adjacent two upper sufficient rollers
Length differ 20~50mm；
In throwing direction, the length of the length of the intermediate projections (110) of the lower sufficient roller of each withdrawal straightening machine and side projections (120) according to
Secondary reduction, under adjacent two under the length of the intermediate projections (110) of sufficient roller and adjacent two sufficient roller side projections (120)
Length differ 20~50mm.
9. improving center segregation of continuous cast slab and loose method as claimed in claim 8, it is characterised in that: in throwing side
It is sequentially increased to the drafts of the upper sufficient roller of, each withdrawal straightening machine, the drafts of first upper sufficient roller is 2~3.5mm, on adjacent two
The drafts of sufficient roller differs 0.5~2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044888.9A CN107774942B (en) | 2017-10-31 | 2017-10-31 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044888.9A CN107774942B (en) | 2017-10-31 | 2017-10-31 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107774942A CN107774942A (en) | 2018-03-09 |
| CN107774942B true CN107774942B (en) | 2019-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711044888.9A Active CN107774942B (en) | 2017-10-31 | 2017-10-31 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56158258A (en) * | 1980-05-09 | 1981-12-05 | Ishikawajima Harima Heavy Ind Co Ltd | Ingot drawing-out device for continuous casting plant |
| CN2431995Y (en) * | 2000-08-04 | 2001-05-30 | 重庆钢铁设计研究院 | Combined jaw-type tension straightening machine |
| CN103464711A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for solving bloom internal segregation |
| CN106001475A (en) * | 2016-06-07 | 2016-10-12 | 东北特钢集团大连特殊钢有限责任公司 | Gradually-varied-curvature convex roller for continuously-cast alloy steel bloom, and heavy reduction process |
| CN107262689A (en) * | 2017-07-06 | 2017-10-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Convex sufficient roll structure and soft reduction process under bloom two is cold-pressed |
-
2017
- 2017-10-31 CN CN201711044888.9A patent/CN107774942B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56158258A (en) * | 1980-05-09 | 1981-12-05 | Ishikawajima Harima Heavy Ind Co Ltd | Ingot drawing-out device for continuous casting plant |
| CN2431995Y (en) * | 2000-08-04 | 2001-05-30 | 重庆钢铁设计研究院 | Combined jaw-type tension straightening machine |
| CN103464711A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for solving bloom internal segregation |
| CN106001475A (en) * | 2016-06-07 | 2016-10-12 | 东北特钢集团大连特殊钢有限责任公司 | Gradually-varied-curvature convex roller for continuously-cast alloy steel bloom, and heavy reduction process |
| CN107262689A (en) * | 2017-07-06 | 2017-10-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Convex sufficient roll structure and soft reduction process under bloom two is cold-pressed |
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| CN107774942A (en) | 2018-03-09 |
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